Toroidal coil winding machine



A'llg. l2, 1947. R, VM, CQNKLIN 2,425,511

'.IOROIDALv COIL IINDING CHINE IFilm1 Aug'. 22, 1945 2 sheets-sheet 2FIG .3

al 2s z2 Y s as 2s [Nys/v To@ RM CON/(LIN er Arromvr Y ly o ccuras aresult winding type wherein the vwire Patented Aug. l2, 1947 TonomALcon. WINDING e n f Robert M. conkun, signor to Western West Newbury,Mass.;l as- JQ ElectricCompany, Incoi'po-v pf rated,New York, N. Y., acorporation oi New o York4 l, Application AugustfZZ, 1945,"Serial No.`11,935 f slolalnis, This invention relates to winding machines,

and more particularly to improvements in `to roidal coil windingmachines.

In winding toroidalcoils, diiiiculties occaslonalof the formingof aAloop in the wiredurlng rotation of `the winding ring in its, circularpath through thel annular core upon which the wire is being wound. Theloop, or length of wire which is to form the next turn upon the core, iswithdrawn from the winding ring as the Wire guide thereof leaves thecore and travels toward the farthest position away fromA the core. Oneof the diillculties arisingv from the existence of the' loop in` thewire is that, during the travel of the wire guide from the iarthestposition toward thev core, occasional breakage of the wire occurs due tothe jerking of the wire in closing the loopa-bout the core. Anotherdiiliculty'lies in the overlaying of the tunis of wireI ony the 'core4tis a result of the loop in the wire being uncontrolled and allowed to.whip from one side to the other. An attempt was made to eliminate theseydiiliculties by' the` provision of a spring' loaded pressure pad functioning in cooperation with a stationary' padto control the loop of WireYduring its advancement of 'the core as disclosed in Patent 2,367,489,issued to A. J. Dowd, January 16,4 194'5. It has been found, however, inactual practice thata single set of'pressure pads will control onlyabouthalf of the wire loop and -will not eliminate entirelythe undesirableconditionsawhich exist in the uncontrolled remaining portion of theloop.

'l object of this invention is to provide a winding machine,Aparticularly of the 4toroidaly coil formingeach turn on the coreiscontrolled toa point closely Lad-,v

-jacent the core. f

Inthe present" invention, movable pressure" l pads are'V disposedv'atVspaced positions "relative to a" iixedpadclosely adjacent acore uponwhich a' WireQis'to `bf`e'1`vound to control thewire in 'itsadva'ncementtothev core, particularly the loop formed Vinl the wiresV"I'hesp'ace'av between vthe pressure pads allows for thefredu'ctioninthe size of the' lo`op"'r.ri`o1`-I tothe iinal releasingof the wire sothat it may complete its turn on the core.

Other objects and advantages will be apparent from the followingdetailed description when considered in conjunction with theaccompanying drawings, wherein:

Fig. 1 is afragmentary side elevational view of a toroidal coil windingmachine embodying the invention;

kthe other half ofthe core.

Fig', 2 isv afragmentary sectional View "taken alongthe line 2'2 of Fig.1; f t

Fig. y3 is a schematic illustration-of 'the various positions of4v the'wire `withdrawnfrom the winding ring'fduringfthel forming of one turnon the core;and

Fig, 4 ,is an View of the structure shown in Fig. 2.

To illustrate the invniaon, only those portions of the toroidal coilwindingf machine essential for this purpose have been. shown in thedrawing. In general, the machine includes a `chuck or clamp I0 forsupporting an annularcore I I' upon whichturns of wire I Z'arefto beformed. The chuck I0 is supported byrsuitable means (not shown) torotate the core labout its axis back and forth forvapproximatelyvone-half revolution to 'cause' distributionof the wire, first uponapproximately one-half vof.;the core. and then upon I2 for one-half ofthe fcoil .iswound in a reverse directionfon a windingfzringmM." Thewinding ring Itis either splity or'providedWitha'removf able section` I5so that the core may be positioned about' the ringv asillustrated,` inthe drawings.

Thewinding ring is providedLWithgear teeth I6 at itsinnerperipheryfforinterengagement with a driving gear I1. The gearilismountedupoii` a shaft I8 which is ydriven yin reverse directions," onefor the winding of the'supply ofthe-wire upon the ring, and the otherfor'thefwinding' of the wire upon the'corea'f Rollers 20, rotatablymounted at Isuitably spacedv posltionshave an-v nular grooves in theirperipheries to straddle the teeth ISJof the` ring' i4.' ,'Iyhe 4ring .I4or the segment I5 thereof is provided With'suitablefwire guidingmeansZItOguide-lthewvire as itpays off the ring and'isadvancedxoward thecore. .l i

vmirino the' v normal. 'oberationI fof theimacvmne for windingf the"wire on fifth '"cor'e,.:"a .Plength fof- "sitionsl 22 .f to1'f2hclusivaf'-as illustrated in:- Fi'gL; "g" ,movement-1 offfltlie: l:ringi I 4- wlthfthegidil I| iroxnithe 'Spositionf" 2=1 to the position 34, a.loop is formed in the length of wire.

The primary object of this viously stated, is to control this loop andto direct it to the portion of the core where it is to be laidsubstantially parallel with the previous turn on the core. I'his isaccomplished through the aid of a stationary pad 36 and companion pads31 and,38. The pad 36 may be enlarged`I fragmentary' sectional AArsupplyofthe wire invention, as preformed of suitable materials, the mainportion 39 being formedl of a more wear-resisting material, such assteel, while the insert or other portion 40 may be formed of brass orother material which may provide a better gripping -surface to cooperatewith the movable pads 31 and 38. The pad-31;. issupported in aslot' Mofabracket 42 so `as to be able tofioat'therein under the control of itsspring 43. The bracket -42 is mounted on the main frame of the machineat the rear of the ring I4, the portion in which the slot 4| is disposedbeing adjacent the center of the ring. A laterally' extending portion44- ot the pad 31 engages a pin 45 which limits longitudinal movement ofthe pad, the pad, however,

. being free except under the force of the spring 43, to move away fromthe pad 36 a distance suicient to allow for the movement of the wirebetween the pads. The pad 38 is pivotally-supported at 4i in the groove4l of the bracket 42. A spring 48 normally urges the free end of the pad38 into engagement with the insert 40, of the pad 36 at a positionspaced from the exit end ofthe pad 31 andvclosely adjacent the core.Thek force of the springs 43 and 48 may be varied by movement ofadjusting screws- 49 and 50.

During the operation of the winding machine, the central portion of thelength .of wire extending from the core Il to the guide 2| at position21 in Fig. 3, engages the entrance Vend 5l of the pressure pad 31. ringI4 and guide 2l, through positions 28 to 34,

During the advancement of the inclusive, the wire isr pulled-between thepressure This pulling of the wire, which is in the form of a lopnnoesnot vdisturb the wire which constitutes the lower half l of the loop.That portion of the wire originally positioned between the pressure pad31 and the pad 36 continues. to move therebetween without advancing .thewire to present any portion of the lower half 4 `of the loop betweenthese pads. the wire should be allowed to pa'ss directly upon l the corefrom between the pressure pads 3B and Therefore, if

31, a loop of appreciable size would exist and could not becontrolledagainst whipping from 45 one side to the other, nor. frombeing jerked onto the core.` The space between the pressure pads 31 and38 releases the loop so that it may be drawn tightly aboutthe pressurepad 38. The loop is thus reduced to a size substantially close totheloop or turnlt will form on the core before the wire is released toiinally lay on the core. This is clearly illustrated in liig 3, whereinthe loop of wireis reduced to substantially the size ofthe turn it willform on the coreand is directedA to the portion on the core where it isto lie. By so guiding the wire on the core, a greater number of turns ofwire may be laid on the core in the same winding space allowed. ThisVim..

` proved space factor results in wider inductance range and in higherquality factors which improve the performance of such coils for theparticular apparatus for which they are to be used. Although specificimprovements of the invention have been shown and described, it will beunderstood 'that they are but illustrative and that variousmodifications may be made therein with- 5 ing ring, for a supply ofwire, rotatable in a circular path through an annular core to wind turnsof the7 wire on'the core, a stationary .pad extend- 4ing inwardly of thewinding ring from a position adjacent the core, an inner pressure padhaving 10 its' entrance end for the wire positioned adjacent ,theYcenter of the winding ring and its exit end disposed short of the end ofthe stationary pad adjacent the core, means to normally urge the innerpressure pad towards the stationary pad l5 to cause the pads to grip andcontrol movement of a loop of the wire moving toward the core, and anouter pressure pad normally engaging thestationary pad at the endthereof adjacent the core and spaced from the exit end of the innerpressure pad whereby the loop of wire will Y beheld until it is reducedto substantially the size of the turn it will form on the core.

2. In a tcroidal coil winding machine, a winding ring, for a supply ofwire, rotatable ina circular path through an annular core to wind turnsy `of the wire on the core, a stationary pad extending inwardly of thewinding ring from a position adjacent the core, an inner pressure lpacihaving its entrance end for the wire positioned adjacent the center ofthe winding ring and its exit end disposed short of the end of thestationary pad adjacent the core, means to normally urge the innerpressure pad toward the stationary pad to cause the pads to grip andcontrol movement of a loop of the wire moving toward the core, an

outer pressure pad spaced from the exit end of the inner pressure padadjacent the outer end of the stationary pad. and means to cause theouter pressure pad to hold the wire against 0 movement onto the coreafterlt leaves the exit end of the inner pressure pad until the loop inthe wire has been reducedto substantially the size of the turn it willform on the core.

3. In a toroidal .coil winding machine, a winding ring, for a supply ofwire, rotatable in a circular path through an annular' core to windturns 011 the wire on the core, a stationary pad extending inwardly ofthe winding ring from a positionladjacent the core, an inner pressurepad having its entrance endv for the wire positioned adjacent the centerof the winding ring and its exit end disposed short of the end of thestationary pad adjacent thecore, means to normally urge the innerpressure Dad toward'the stationary pad to cause the pads to grip andcontrol movement of a loop of the wire moving toward the core. an outerpressure pad normally engaging the stationary pad at `the lend thereofadjacent the core and spaced from the exit end of the inner pressure padwhereby the loop of wire will be held until it is reduced tosubstantially the size of the turn it will form on the core, and meansto vary the pressures of the inner and outer pressure pads on thestationary pad and the loop of wire when passing therebetween.

ROBERT M. CONKUIN.

